- Point-to-point
- Backbone area 0
- Broadcast multi-access
- Non-broadcast multi-access
- IS-IS
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Answer: Option 1
No DR is assigned on any type of point-to-point link. No DR/BDR is assigned on the NBMA point-to-multipoint due to the hub/spoke topology. DR and BDR are elected on broadcast and non-broadcast multi-access networks. Frame Relay is a non-broadcast multi-access (NBMA) network by default.
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